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# Copyright (C) 2023-present MongoDB, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the Server Side Public License, version 1,
# as published by MongoDB, Inc.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# Server Side Public License for more details.
#
# You should have received a copy of the Server Side Public License
# along with this program. If not, see
# <http://www.mongodb.com/licensing/server-side-public-license>.
#
# As a special exception, the copyright holders give permission to link the
# code of portions of this program with the OpenSSL library under certain
# conditions as described in each individual source file and distribute
# linked combinations including the program with the OpenSSL library. You
# must comply with the Server Side Public License in all respects for
# all of the code used other than as permitted herein. If you modify file(s)
# with this exception, you may extend this exception to your version of the
# file(s), but you are not obligated to do so. If you do not wish to do so,
# delete this exception statement from your version. If you delete this
# exception statement from all source files in the program, then also delete
# it in the license file.
global:
cpp_namespace: "mongo::execution_control::throughput_probing"
cpp_includes:
- "mongo/db/storage/execution_control/throughput_probing.h"
server_parameters:
throughputProbingStepMultiple:
description: "The step size for throughput probing is this multiple of the current concurrency"
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<double>
cpp_varname: gStepMultiple
default: 0.1
validator:
gte: 0.1
lte: 0.5
throughputProbingInitialConcurrency:
description: >-
The initial number of TOTAL concurrent read/write transactions for throughput probing. The
default value of 0 means to use the number of logical CPU cores.
set_at: startup
cpp_vartype: int32_t
cpp_varname: gInitialConcurrency
default: 0
validator:
callback: validateInitialConcurrency
throughputProbingMinConcurrency:
description: >-
The minimum number of concurrent read/write transactions for throughput probing. This minimum
is applied to reads and writes separately.
set_at: startup
cpp_vartype: int32_t
cpp_varname: gMinConcurrency
default: 4
validator:
callback: validateMinConcurrency
throughputProbingMaxConcurrency:
description: >-
The maximum number of concurrent read/write transactions for throughput probing. This maximum
is applied to reads and writes separately.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<int32_t>
cpp_varname: gMaxConcurrency
default: 128
validator:
callback: validateMaxConcurrency
throughputProbingReadWriteRatio:
description: The ratio of reads/writes when using throughput probing.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<double>
cpp_varname: gReadWriteRatio
default: 1
validator:
gt: 0
throughputProbingConcurrencyMovingAverageWeight:
description: >-
How much to weigh newer concurrency measurements into the exponentially-decaying moving
average. Higher values respond faster to changes, but with more variability. Lower values
respond slower, but with less variability.
set_at: [ startup, runtime ]
cpp_vartype: AtomicWord<double>
cpp_varname: gConcurrencyMovingAverageWeight
default: 0.2
validator:
gt: 0
lte: 1
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